Only thing, is the tremolo section. You tied it in decently, but I think maybe adding in a string motif reminiscent of the Main section would be legit. I just copy-pasted the same 2 bars of 4/4 from right before the Tremolo section over and over again on top of Tremolo, and it sounds pretty cool... So I know something like that would fit.

I also just threw on the 4/4 bars form the "du du du du" section on the jazz guitar and that fits in with all of it as well.